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Canning -- Miscellaneous
Is it all right to reuse jar fittings (lids and bands)?
Lids should not be used a second time since the sealing compound becomes indented by the first use, preventing another airtight seal. Screw bands may be reused unless they are badly rusted or the top edge is pried up which would prevent a proper seal. Source: Original FAQ posted at http://184.108.40.206/faq/FAQ_home.php